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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f1a4abb4621e95ae5c3e4da36409de9912e701428ee91a29fa34b6b9c78501' 
  AND token = 'kAHyNCYFdEekIG+A+lj2SxmeOJivuy8dXqugeiRLwfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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