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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877b6973eac510d95d189a2bc550c9285ca6be9b3759438bfd6d8539934047e2' 
  AND token = '7AutQaIgX8CdQZ8Ui+PuYpVaKQ8eblVVAdE+5RR+5VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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