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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef6ffa2b1c23541c933f662a49dfb5f7b0fe117d786a61aa519ae6f7aa95724' 
  AND token = 'g2rCVMHJPphgfxJekvPg1q9YagDTItHuG/hhgLcYl0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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