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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d07acd32f922de699b658cc9f1b8ed6cdede2753146a4741a626622c771ca1' 
  AND token = '1XlOtH2glnSaMv9gkZXpXHpa+2A0sqq3is1+b+xy0YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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