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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817b93de4ec217f8f2e0c30b349369f7bdf659c048e1f9e292affffcf156b4fb' 
  AND token = 'L1yeYJ4vY89kPALve0gQfXovkVojPt9uBHbo649J2cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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