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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712764fa49bc24896559cb31064c809aa66ebc134a2cc3f52b06508d9443c13e' 
  AND token = '6kZEwTx/ey59fTWgfvnIRofruR8M09toPr/nE3X2peY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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