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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea8f070a5183da8d188c4551335b993b0e35a3c3a9f0bcaf20568ede70c01c4' 
  AND token = 'Gu0FmnTgaSHD0648yEQAdlXwh6s159Vdst8US+clknk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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