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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7353ff5adcf6364666497b04f4cec4ecff0d556600f5f1710d6989d5b45632d' 
  AND token = 'RVjqWv8dHBkw84ctDEZ4PnBNFjVQ2dUv2IyCdkYBV/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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