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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1315be32b9376bcff03c4ce28a469d8c3e2a52576b85f1f58eab0676a65a0173' 
  AND token = 'jET9peFzuHCYm31ZZiMGfqf7rFWsrs+byA+87MGro9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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