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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298d5e4d36d384b3e8ba6d69e856ceaad4464b1a2addd0105b7fcf70259d81ac' 
  AND token = '/2XJ7PCr1ImuHBwOg/HAmMQRdxkk7lJJdfwTpeEa5Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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