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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50a8fb9611549a0c2306041afb3601da4f6c60e8c915ca08c91abd02986dc2a' 
  AND token = '+zM9HU433jWJEnAqr/8qW8QaIXSWRkyi/jYsbSiozKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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