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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a5ee1ebc5e36dc984bd44e10aefe5a129d3b704f22e8d0e8f38c6616f90f14' 
  AND token = '5csotzAAQq1fe1iL9CA6yw3P5abQ71Ana/2R3ST9VK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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