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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef419c243f16d1dbd0f4339dd843dc5093944c119374d862744bdcd89b8fa274' 
  AND token = 'h5ehDjpqDj1Td24ma+uYI2WBaZ6SoK7BVmkZxsqAvS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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