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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f508626d95f2b6cbc6b3c7458bb3f119a118ee0640a99768ce3b8a09e1a90843' 
  AND token = 'BMu5fslzEIhUJZnBAGCLd18lr9z+vUGNmnP9348ECR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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