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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71deffb1c142547b721fa9a235e5c4fb78c23084733e566809f5d0438cf705e' 
  AND token = 'ba2+5kAHKgjMOpE21T+jJnwA9w3vIkY+4CObkZo33q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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