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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea6af375cdad9f834ddeaacdd656528518241e04c92e5d15f03c0bc8b23711b' 
  AND token = 'OAI2q+r+zKhzjsxqFhNhhL/+bOnMX7lbo7+F+t7XeRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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