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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344f02bf59c0400576101e5e1cec803b23115d4094949cc9e88fd667c3fe2bdb' 
  AND token = 'tEXQrI2CIxTvAvvE2QcXP8kMTurviSeHjX1ZLCoKuDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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