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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7002713010c0ab89fe1e547c107a8ece01cd50e7205cdd8f559a9638b889c8c9' 
  AND token = '2yI73PZYkWu+f6lTAYi2urT69Md3jdERe7tLPZGER4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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