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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e631cc5400f51c18bc9754e019092b3323b54d3c4bf03d4a6d385e554051b7d8' 
  AND token = 'sBOEw5hqL7vlV9rKR+2kvOA1FE2WYEWxAcmNRgGxptc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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