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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30544868371d1d2fc8a63cbc35afc8f6a1e794033cb250151995826bb860bf73' 
  AND token = 'RW/TcpKDU3cvnTB14z2fctjSeJ8a1hTwzw2OZZuT14Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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