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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3070c09c76853edeb3160da538de2b7f31f82d22397c33510af6d5f20b8d2c' 
  AND token = 'ftq4IQPVTVORHH35ZfiwXH4c3xP+BisYThgRec7RtOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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