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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f99f9dedb31627b2cf881b279e397becc929fde82ed722c25c09b589ca5e545' 
  AND token = 'KEbpwHOoA2C5KQGwrObIObJUL0eyjas85AgRhD9Fetc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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