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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2d6a4a2287d6cd3f88b5c536cb3a4b919bb5947f4ad393f76f866814734755' 
  AND token = '44DH77+JxZKUr73SlT7pqDmxFCJIj0ap9xmJ2TG2GnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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