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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6e636dada40b3ce3ec0b73520e9c841d57c2d66bbf20c0ba7096b7d4135f1a' 
  AND token = 'yUS767odn7W+9f0fO5np6THkfODMgnwpyfHYxShrWhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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