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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1bcfa089c0d1ed54cf93ad78787915ca789171eef7b8833f5627c1d5addbca' 
  AND token = '7hkv/sfJ+JALMMYl4fplW+6UfvhFNmioWRWEMW8fDHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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