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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4011ba2dd67674ec664c9508b53f982d9f3d535ce16d4395c12800dc73e9c6' 
  AND token = '2m9mg+2rYMXvf0cTYF+6nRc3qPnAi330NoAe0PBE7BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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