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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02099e6a0e0d95f6507980c0f392e7dfc8e5f99bfdb89804901745092327fcd8' 
  AND token = 'iyHAZGpQx68N9ARLtXyYHaIvCF5icYYj5a3T70Ns9f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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