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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb89f5626fe7a1cbf8f879479c522755197f68bc137f219e841a9c3531187b08' 
  AND token = 'kP4GhCGYo8mOMOWnNHCVWF5iiwb3HPcvGBDDNhXBEBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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