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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a954a6acfe8d74e34de9b6df06cce1a34bd79d0655a2636bd152bcffa477efb6' 
  AND token = 'yqcWBSMPJC7+mMALdboq01VU0F8acrQapwG8TKx2qIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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