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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570c0a287b6e3ad004324ddd87f9437b39741a71ccfbdd7c34b7ca2d4d4038ce' 
  AND token = '1kvHciZ1miB6RvK4SAYsEv/BBuGI1Ix+8X5m/RcSXJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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