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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5610a623a2d9a8e90c43cf7576913a61dd17cf86b951a7d69d217edf6b9c7a9f' 
  AND token = 'rY7biTwaossaC36A7E4o12ApeAU8ftXL3SJM1g04wTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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