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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17857d36f9eb824f7ffcfaeb51be6e03a5f3e5581b30da25c9eb3d7e7941d09' 
  AND token = 'P4cAQKiZgLiLFuQg/6Wk75T9Pb4Iw68ry3NDzAnIBaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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