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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1b8573dac615d81d101f794301730ec9dc4c2d4ee73e71a26595f07f79ab5c' 
  AND token = 'At1Zb1L6JVJbuORCK9FB3cXtMZ35hHaYC4dQ04aUdbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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