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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e7db2fc2dce587b70cc9b928dccbabebdc28223e7b10a836ed3a4977b37d90' 
  AND token = 'z9sae1+eGOO9UDn2oXKGp93zEAHjJYxfKSOs1lbXKo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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