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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fc87d6b2dd8d1d191cb985993c809fa55794b2b29499db2d7100c7db319d69' 
  AND token = 'E68EOo7UJmG+mH+5Sxdjmp/y4FK+qr2HltfxTyZb/Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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