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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e56dc2061f184924fd296e06a1cc9c70d215be46994ee540129c01154f78a94' 
  AND token = 'Zp5dtpkX6eqEH4/VY6BnKZPT4eBwYij8k01D2XDNb+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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