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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6fe9e7188f8b8bb1b88ae1642b2c5c58d1bce36f350d2a7dd5841b942f547c' 
  AND token = 'fwkraY/VPqhdLIM00PbJEKaWE+alNl9Ftgf2gaF+dAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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