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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c986f8a23440e506297b73399f0e5c384e8ecd350a386e73d43b2da25e360cc2' 
  AND token = 'BXEJqiCKmyhPlm0BVRLEElOH1MxRJHMwX0g6rkq+7uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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