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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eaba29d8f5394c44d69d52331641311887847bd0e42fa08c09e5af746922879' 
  AND token = 'IV5vlkPE4y+JgLlORvcbgqT9ew2ABDyk7h/0iLx4ARc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}