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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbdec9176b56b63291ec39d77f0aa35b11f55af9e6cfe2f2ab07a5d77e9eccb' 
  AND token = 'Ovrni/m66T67hCUBHcqhxvu7XDKfXIrEmV+i0Gcwt+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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