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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af83ae8d993e54328b5b4dc2655e2fc2b2eca265c8b7dcc65187579642ec7d45' 
  AND token = '4L0rjdHjcjXDH+iVlZfFc33Sd38LMUf6ScQYC0ENC+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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