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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c314cc7be61afb459c7cd8a5dc569630c72b1446b622da0c96303e81defd91' 
  AND token = 'kL/cNW7hq2zIIo0H0CTT8cHp2aTmERO47VjXgAcrsfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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