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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8819325f1c9ba4c4f70a310c4975fa2a64770e850bdafd3a989d8309af95c929' 
  AND token = 'cUt88Ww+q5R0A6JBvnytALFdp0FYuSFizpboz8uoK/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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