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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beff71df5f299f31c9cd40e6698a17cbd0b5cb4078b0098b0649e0603f227737' 
  AND token = '4QM/f/W06HSkLNDX9NU/MUoSl8eNma3MdNUFYMvHIo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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